Plateau Meteorology

Plateau Meteorology >

2018 , Vol. 37 >Issue 2: 406 - 419

DOI: https://doi.org/10.7522/j.issn.1000-0534.2017.00046

Numerical Simulation and Stage Structure Characteristics of a Plateau Shear Line Process

  • LUO Xiong ,
  • LI Guoping
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  • School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, Sichuan, China;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing 210044, Jiangsu, China

Received date: 2017-06-17

  Online published: 2018-04-28

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Abstract

Using the non-hydrostatic mesoscale WRF (Weather Reaserch Forecast) model, and combining with the National Centers for Environment Prediction Final Analysis (NCEP-FNL) data, the conventional observation data, the temperature of black body (TBB) data from the Fengyun-2F (FY-2F) satellite and the Climate Prediction Center Morphing Technique (CMORPH) precipitation data, the plateau transverse shear line process occurring from 29 June 2014 to 1st July was simulated, and the structural characteristics of precipitation, thermodynamic, water vapor and dynamic in the course of evolution were analyzed. The results show that the WRF model successfully simulated the precipition and precipition area caused by the Plateau shear line. During the shear line process, there are significant differences in the structural characteristics of different stages. It usually corresponds to the cloud sector of TBB < -20℃ nearby the shear line; with the developing of the shear line, the TBB decreases, and there are many convective activities centers of TBB < -60℃, corresponding to the main period of precipitation; TBB increases again during the weakening stage of the shear line and the precipitation goes to end. The plateau shear line has a thermodynamic structure of "warm south but cold north", the vertical distribution characteristic of high level stability and low layer instability appears during the development and maintenance stage of the shear line; the plateau shear line is the water vapor congregated zone, the change of water vapor flux divergence has a certain effect on the development of plateau shear line. Above the vertical direction of the nascent, developing and maintenance stage, there are positive vorticity and converge centers which both present a dynamic system of lower troposphere positive vorticity coupled with the high potential vorticity. The cyclonic shear is favorable for maintaining the positive vorticity of plateau shear line; lower level convergence and upper level divergence structure on divergence field is conducive to the development of vertical ascending motion of the shear line; and it is a characterstic signal of plateau shear line weakened that the converge zone begins to subside then disappear in advance of the positive vorticity does.

Key words： Plateau shear line; numerical simulation; convective cloud clu; water vapor flux div; shear vorticity; structure characteri

Cite this article

LUO Xiong , LI Guoping . Numerical Simulation and Stage Structure Characteristics of a Plateau Shear Line Process[J]. Plateau Meteorology, 2018 , 37(2) : 406 -419 . DOI: 10.7522/j.issn.1000-0534.2017.00046

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